package org.bouncycastle.asn1.misc;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DEREncodable;
import org.bouncycastle.asn1.DERInteger;
import org.bouncycastle.asn1.DERObject;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.DERSequence;

public class CAST5CBCParameters implements DEREncodable {
    DERInteger keyLength;
    ASN1OctetString iv;

    public static CAST5CBCParameters getInstance(Object o) {
        if (o instanceof CAST5CBCParameters) {
            return (CAST5CBCParameters) o;
        } else if (o instanceof ASN1Sequence) {
            return new CAST5CBCParameters((ASN1Sequence) o);
        }

        throw new IllegalArgumentException("unknown object in CAST5CBCParameter factory");
    }

    public CAST5CBCParameters(byte[] iv, int keyLength) {
        this.iv = new DEROctetString(iv);
        this.keyLength = new DERInteger(keyLength);
    }

    public CAST5CBCParameters(ASN1Sequence seq) {
        iv = (ASN1OctetString) seq.getObjectAt(0);
        keyLength = (DERInteger) seq.getObjectAt(1);
    }

    public byte[] getIV() {
        return iv.getOctets();
    }

    public int getKeyLength() {
        return keyLength.getValue().intValue();
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * 
     * <pre>
     * cast5CBCParameters ::= SEQUENCE {
     *                           iv         OCTET STRING DEFAULT 0,
     *                                  -- Initialization vector
     *                           keyLength  INTEGER
     *                                  -- Key length, in bits
     *                      }
     * </pre>
     */
    public DERObject getDERObject() {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(iv);
        v.add(keyLength);

        return new DERSequence(v);
    }
}
